Transformer-winding.



0. LE G. FORTESGU-E. TRANSFORMER WINDING. APPLIO'ATION FILED (m s, 1910. BEKEWED AUG. 20, 1914. l 31.29%171 O. w 5 m 11 L 0 9 s s T 1 m N 00 m 2 S W. Q. N. h .v w id 6 T & Q. E m a S k k m z fl H w .Q N% a D WITNESSES:

ATTORNEY G. LE G. PORTESUUE.

TRANSFORMER, WINDING. APPLICATION FILED OCT. 8, 1910. RENEWED AUG. 20, 1914.

,47 Patented Feb. 23, 1915.

2 SHEETSSHEET 2.

4 a Z 7 INVENTOR ATTORNEY r en 1 "he: wishes INGHGUSE ELFETBIC AN? IMW'EAGTUEHNQ PE'eHTSYLVANIA.

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Specification of Letters Eatent. P g -egg; p s 2 1915,

original application filed August 2, 199$,Serial Ho. 519,854. Divided and this application filed Butcher :8,

1510, Serial Etc. 5%,fi9l3. Renewed august 2d,,181d. Eerie Ho. 857,773..

To all whom it may concern Be it known that I, CHARLEs LE G. Fon-- rnsoon, a subject of the King of Great Britain, and a resident of Pittsburgh, in the county of i llleghenywand State of Pennsylvania, have invented a new and useful Improvement in Transformer-Endings, of which the follo ing is a specification, this being adivision of application, Serial No. 510,854 filed August 2, .1909.

My invention relates to transformers and it has special reference to the windings and insulation of such transformer as are adapted for very high-voltage. service.

' The object of my invention is to provide a winding which shall require a very small amount of insulation, relative to the voltage of the transformer, with a view to reducing the space occupied by the insulation and the manufact,uring cost of the transformer.

Figures 1 and 2 of the accompanying drawings are, respectively, a sectional plan view and a view, partially inelevation and partially in section, of a portion of a transformer constructed in accordance with my invention. Fig. 3- is a view, partially .in .lGVEltlOIl and partially in section, of a transformer having a modified winding and composed of two, instead of a single group of coils, as hereinafter pointed out.

Referring to Figs. 1 and 2 of the drawings, the structure here shown comprises a substantially rectangular core member 1, a low-potential winding 2 that is divided into two groups of coils which surround two opposite legs 3 and e of the core "member 1 and are separated therefrom by insulating sleeves 5, a primary winding composed of two groups 6 and 7 of relatively fiat coils, insulating sleeves 8 and 9, located on the respective core legs 3 and d between the low and high-potential windings, and insulating barriers 10- and 11 that separate the high-potential windings from the walls of a tank or casing 12 in which the transformer is located, The core'legs 3 and i maybe of any suitable form but are preferably cruciform in cross-section in order to economize-space and reduce the mean length of turn in the coils.

The insulating sleeves 8 and 9 are alike and each preferably comprises a iilurality of alternately disposed cylinders '13 of conducting material and cylinders 1450f non: conducting material. The cylinders are of different lengths, the longer ones being adjacent to the low-potential winding and the shorter ones adjacent to the highrpotenti'al winding. By this means, the surface distances between the conducting cylinders are made adequate to correspond. to or to exceed the potential which the non-conducting cylindersare capable of withstanding.

it has been my aim to so arrange and connect the coils ofthe high-potential winding as to obtain a maximum degree of separation between the high-potential coils and the COI'B HlQ-Hlbfil', the coils of lower-potential being disposed at shorter distances from the exposed portions of the, core member, the space within the core member being thus quite fully Elie circuit connections-for the primary windings are clearly set forth in Fig. 2, to which special reference may now be had.

One terminal 150;? coil 16 is connected to a higlnpotential conductor and its other terminal is connected to one end of the conducting cylinder 13 The coil 17 is connected between the other end of the cylinder 13 and the coil. 18, and the latter is connected to one end of the conducting cylinder 13* which surrounds the core leg 3. The other end of the cylinder 13 is connected to one terminal of coil 19, the other terminal of said coil being connected to one terminal of coil 20. lhe opposite terminal of coil 20 is connectedppthrough the conducting cylinder of the insulating tinned, in a similar manner, from a coil of one group to a second coil of the same group, through a conducting cylinder and, from thence, directly to a coil of the other group, circuit again being continued through a conducting cylinder. The coils are successively connected in the order of their referen ce numerals from 16 to 31, inclusive. This arrangement is specially adapted for use in transformers having one terminal grounded or in transformers which are starconne'ctcd in groups of three with their neutral point grounded. For exainple,terminal 15* of the transformer of Fig. 2 may be connected to ground thereby making-15 the high voltage terminal of the transformer winding. If three complete transformers like that of Fig. 2 are usedon a three phase circuit, a star connection can be'secured by interconnecting the terminals 15, the ter- -minal's l thenheing respectively connected as the three line conductors. The common terminal may then be grounded if desired. In all cases where one terminal of the high potential winding is grounded, the grounded terminal is connected directly to winding coils which are adjacent to the exposed legs of the core mam. er.

The sleeves or barriers l0 and 11 are preferably' of the condenser type insulation, consisting'of alternately arranged insulating layersfll) and 11 and conducting layera and 11 unnecessary separation between the groups of coils within the core member, and to more nearly secure an equality in the areas of the conducting layers of the barriers, they are. cut back as shown in Fi 1 and corre- 7 b 'sponding conducting cylinders of the two barriers are interconnected electrically at if)v to adequately separate the coils from tank or. casing 12, without necessitating a special form 0 sleeve.

The insulating sleeves and bushings hereinbefore referred to are preferably con-- 'structed as set forth in Patent No. 858,385, granted July 2, 1907, to the Westinghouse Electric dzManufacturing Co, as assignee ofiEmil l-laefely, sheets of t in-foil, or other suitable conducting material, being interposed, at convement or deslred intervals,

between the c'onvolutions of insulating material, during the construction of the device.

' .-tential winding is divided into two groups Fig. 3 shows a winding which is similar to that of Fig. 2, except that the high-powhich are so interconnected that both terminals of the high-potential winding may be connected to high-potential line conductors. Y v ,The circuit connections through the winding coils may be traced as follows: from terminal of conductor 32, through coil 33,

conducting cylinder 34,.coils and 36, cylinder 37, coils 38 and 39, conducting cylin-. der. l0, coils 41 and 42, conducting cylinder l3, coils 44c and 45, conducting cylinder 46,

, coils 4'7 and 48, conducting cylinder 49 to the coil 50. Circuit is continued from this point through. coils 51 to 62, inclusive, in the order named, opposite terminal 63 being connected to the coil 62. The coils 51 to 62,

inclusive, constitute a group which corresponds to the group comprising coils 33to 50, inclusive, the two groups being con-' nected in series when the coils are in the reverse order. By this means, the terminals 32a'nd 63 are both connected to a midi die coil of the above-mentioned group-to,

- carried'bythe insulating material and con p rts j-of the' connections between which they belong. V

l do notfxwish to be limited to the arrangements shown in the drawings, sincemodifi ic ations mayevidently be effected spirit endoscope of my invention.

but, in order to avoid an- I claim as my invention:

1. A transformer comprising a substantially rectangular core member, two groups of coils disposed on the opposite legs of the core, and insulating sleeves separating the groups from the core legs and composed of a series of condensers, the coils of both groups being connected in a series in which the middle coils of one group are successively connected to the middle coils of the other group, the next outer coils of the first group, the corresponding coils of the second group, the next outer coils of the first group, and so on, to the outer coils of the second group, through the agency of the conducting plates of the condensers.

2. A transformer comprising a substantially rectangular core and a plurality of coils disposed end to end, in two groups, on opposite legs of the core and insulating sleeves disposed between the coils and the core legs on which they are mounted, said coils being connected in a series of which the middle coils of the groups constitute one end and the end coils of the two groups the opposite end.

3. An electrical devicecomprising a core member, and two groups of coils thereon that are connected in a series in which the respective coils are connected at one end to coils of the same group and at their other ends to coils of the other'group.

4. An electrical device comprising a core member, and two groups of coils, thereon that are connected in a series in which the terminal coils are connecte'dto coils of the same group, and each of the remaining coils is connected at one end to a coil of the same group and at the other end to a coil of the other group..

5. An electrical device comprising'a core member, and two groups of coils thereon that are connected in a series in which pairs of coils from difierent groups alternate in position.

6. An electrical device comprising a core member, two groups of coils thereon that are connected in a series in which pairs of coils from dilierent groups alternate in position, insulating material interposed between the core and the coils, and conductors carried by the insulating material and constituting parts of the connectionsbetween coils from different groups alternate in po- 'sition, insulating material interposed be tween the core and the coils, and conductors at mile ofthe same oup.

f two groups of side-ligside All idevice comprising a core coils thereon that are connected in a series in which pairsof coils from diilerent groups alternate in position, the series beginning with lntermediately located coils and ending with outer coils.

9. An electrical device comprising a core alternate in position, the series beginning with intermediately located coils and ending with outer; coils, insulating material interposed between the core and the coils, and conductors carried by the insulating material and constituting parts of the connections between the coils.

10. An electrical device comprising a core member, two groups of coils thereon that are connected. in a-series in which pairs of coils from difierent groups alternate in position, and an insulating structure that is interposed between the coils and the core member and comprises two sets of superposed layers of insulation of graded lengths, and conductors exposed at the endsoi' the layers and connected to the coils. l

11. An electrical device comprising two groups of coils that are connected in a series in which pairs of coils from different groups alternate in position, an insulating structure adjacent to the coils composed of two sets of superposed layers of insulation of graded lengths the outer ends of which overlap, the end coils of the series being placed adjacent to the outermost layers, and conductors 6X' posed at the ends of the layers and connected to the coils. r

12. An electrical device comprising two groups of coils that are connected in a series in which pairs of coils from difierent groups alternate in position, an insulating structure adjacent to the coils composed of two sets of superposed layers of insulation of graded lengths the outer ends of which overlap, the end coils of the series being placed adjacent to theoutermost layers, and conductors exposed at the ends of the layers and included in the connections between the coils.

I 13. An electrical device comprising two groups of coils that are connected in a series in which pairs pf coils from different groups alternate in position, an insulating structure adjacent to the coils composed of a main layer, and two sets of: superposed layers of graded lengths, the end coils of the series being placed adjacent 'to the outermost.

, layers.

14. An electrical device comprising .two groups of coils that are connected in a series in which pairs of coils from different groups :30

alternate in position, an insulating structure adjacent to, each group of coils having its endportions and an intermediate portion inclinedrelatively to the axis of the coils,

and spaced'conductors adjacent to the inclined faces of the sleeve and included in the connections between the coils.

15. In an electrical device, the combination with two groups of coils that are con-1 nected in a series inwhich paifs of coils from difi'erent groups alternate in position; of an insulating structure within each group of coils and comprising spaced conductors, the connections between coils of the same group respectively including the said con ductors.

16. In a transformer, the combination with a magnetizable core having two legs,

and two groups of coils respectively surrounding the legs of the core, of insulating structures respectively partially surround ing the two groups of coils, the edges of said structures meeting in the space between the two groups of coils.

17. In atransformer, the "combination with a core structure having two legs, and, two groups of coils respectively surrounding the core legs, of insulating structures respec-.

tively partially surrounding the two groups of coils, the said structures being composed of alternate layers of insulating and conducting materials, the edges of which meet in the space between the groups of coils.

18. In 7 a transformer, the combination with a magnetizable core having two legs,

and two groups of coils respectively surroundingthe core legs, of substantially cy-- lindrical insulating structures respectively partially surrounding the two groups of coils, and eccentrically disposed with respect thereto, the edges of the insulating structures meeting in the space between the two groups of coils.

In testimony whereof, I have hereunto subscribed my name this 23rd day of Sept, 10.5

1910. r CHARLES LE G. FORTESCUE.

lVitnesses:

HELEN BURTON, B. B. HINEs. 

